Abstract：A particle flow model of ring-shear test is constructed by the PFC(particle flow code) in which the soil particles are cohesiveless. Compared the result of simulation test with high-speed ring-shear test，the stress changing tendency of the two tests is similar；the levels of stress are close. The uniformity coefficient of the sand sample in ring-shear test is 1.64 and the particle sample in PFC model is 1.45. The linear contact model among balls is adopted in the simulation test，so the test result is suitable for the cohesiveless soil. The shear boundary can make different kinds of shear zones，so three kinds of boundaries are tested，which are wall，ball-circle and ball- circle and teeth boundary. And the ball-circle and teeth boundary is the one that can make shear zone well proportioned.
